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• Big question of Target size, or video bitrate must be specified when using two-pass

  14 juillet 2022, par Rojojun

  I tried to solve the error which is Target size, or video bitrate must be specified when using two-pass.

  


  But I couldn't find how to solve it and how to find path of video exactly I attached my code below this post

  


  Please give me some tips of solving the problem !

  


  @Service
public class ThumbnailService {

    public HashMap exportThumbnail(File file) throws Exception {
        // file is from controller and form-data
        //String inputPath = "Users/hojunna/Download/my/";
        //String outputPath = "/usr/local/video/thumbnail/";

        String ffmpegBasePath = "/opt/homebrew/bin/";
        FFmpeg ffmpeg = new FFmpeg(ffmpegBasePath+"ffmpeg");        
        FFprobe ffprobe = new FFprobe(ffmpegBasePath+"ffprobe");    
        
        FFmpegBuilder builder = new FFmpegBuilder()
                .setInput("/Users/hojunna/Desktop/" + file)                         
                //.overrideOutputFiles(true)                    
                //.addExtraArgs("-ss", "00:00:01")          
                .addOutput("/Users/hojunna/Desktop/test.jpg")       
                .setFrames(1)
                .setVideoFilter("select='gte(n\\,10)',scale=200:-1")
                .done();

        FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);      
        executor.createJob(builder).run();                                  
        executor.createTwoPassJob(builder).run();                           

        HashMap resultMap = new HashMap();
        return resultMap;
    }
}


  


• Question about coding design of interface and receivers

  14 décembre 2018, par the_real_one

  I am trying to create an interface for an FFmpeg conversion scheme where :

  • New() should return whatever implements it
  • (receiver *interface) Convert() is the only method that should be implemented and the underlying details hidden (source files from : URL, File, etc.)

  How would I accomplish the above problem and design the code in such a way that you have various New() methods returning an FFmpegConverer that enforces the implementation of the Convert() method but with the underlying details behind each New() being different ? Or is that just a bad design to begin with ?

  My code may be less relevant than my problem statement but this is what I have so far which does not pass any go sanity checks :

  // FfmpegConverter is the interface for setting the public facing local
  
  // video files
  
  type FfmpegConverter interface {
  
    Convert() error
  
  }
  
  
  
  // localVideo holds the file information for a downloaded video
  
  type localVideo struct {
  
    inputAudioFile * os.File
  
    inputVideoFile * os.File
  
    outputVideoFile * os.File
  
  }
  
  
  
  // New initializes a new FfmpegConverter
  
  func New(inputVideoFilePath string, inputAudioFilePath string, outputVideoFilePath string)(ffmpegConverter FfmpegConverter, err error) {
  
    ffmpegConverter = & localVideo {}
  
  
  
    // Set input video file
  
    ffmpegConverter.inputVideoFile, err = os.Open(inputVideoFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.inputVideoFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    // Set input audio file
  
    ffmpegConverter.inputAudioFile, err = os.Open(inputAudioFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.inputAudioFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    // Set output video file
  
    ffmpegConverter.outputVideoFile, err = os.Create(outputVideoFilePath)
  
    if err != nil {
  
      return
  
    }
  
    if err = ffmpegConverter.outputVideoFile.Close();
  
    err != nil {
  
      return
  
    }
  
  
  
    return
  
  }
  
  
  
  // Convert will convert the input video and input audio files to an combined
  
  // output video file
  
  func(l * localVideo) Convert()(err error) {
  
    // Do stuff with the internal struct
  
    // ...
  
  }

• question regarding ffmpeg webcam stream (RTMP)

  7 janvier 2021, par J Hwang

  I am a novice if you will regarding FFMPEG.
I was tasked with creating a Windows-based C++ project that takes a live webcam stream, does the necessary decoding and encoding, and sends it via RTMP to a server.
The constraints were that the output format be "flv" due to the design of the server end and that it take both audio and video input. Quality of the stream isn't that much of an issue as long as the audio doesn't desync too much from the video.

  


  I drew on the prior works of https://github.com/leixiaohua1020 in simplest_ffmpeg_streamer and simplest_ffmpeg_device.

  


  Specifically, I tried to mesh together the logic behind the readcamera project to provide an input stream and send it to an output address using the streamer part that previously took a local flv video as input.

  


  However, I ran into some problems.

  


  First of all, I know vfwcap is very much outdated but it seems dshow has some problems with the input part as well as the output part so I'm opting for whichever works first.

  


  Second of all, I don't really understand how to set the codec for the input. The input is using rawvideo by default and I tried to add settings as shown.
pFormatCtx->video_codec_id = AV_CODEC_ID_MPEG4;
However, none of the even slightly relevant codec settings seemed to work. All showed the same error message in the vfwcap error message image below.

  


  I would very much appreciate any pointers on achieving 1. change of codec in input stage 2. fixes for the dshow case

  


  I have put the full code up on github with the appropriate mentions.
https://github.com/luorix1/ffmpeg

  


  error message_dshow

  


  error message_vfwcap